Quartz is added to gypsum bonded investment to______________? – McqOptions

MCQOPTIONS

1.	Quartz is added to gypsum bonded investment to______________?
A.	Increase the strength
B.	Counter balance contraction of gypsum during heating
C.	aid in hygroscopic expansion
D.	Increase the shelf life of investment
Answer» C. aid in hygroscopic expansion

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